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        <h1 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h1><h2 id="Web工作方式"><a href="#Web工作方式" class="headerlink" title="Web工作方式"></a>Web工作方式</h2><p>我们平时浏览网页的时候，会打开浏览器，输入网址后按下回车键，然后会显示你想要浏览的内容。在这个看似简单的用户行为背后，到底隐藏了些什么呢？？</p>
<p>对于普通的上网过程，过程为：浏览器本身是一个客户端，当输入URL的时候，首先浏览器会去请求<br>DNS服务器。</p>
<p>通过DNS获取相应的域名对应的IP，然后通过IP地址找到IP对应的服务器后，要求建立TCP连接。</p>
<p>等浏览器发送完HTTPRequest(请求)包后，服务器接收到请求包开始处理请求包。服务器调用自身服<br>务，返回HTTPResponse(响应)包。</p>
<p>客户端收到来看服务器的响应后开始渲染这个Response包里的主体(body)，等收到全部的内容随后断开与该服务器之间的TCP连接。</p>
<p>一个Web服务器也被称为HTTP服务器，它通过HTTP协议与客户端通信。这个客户端通常指的是Web浏览器(包括手机上的各种客户端))</p>
<p>Web服务器的工作原理可以简单的归纳为：</p>
<ul>
<li>客户端通过TCP/IP协议建立到服务器的TCP连接</li>
<li>客户端向服务器发送HTTP协议请求包，请求服务器里的资源文档</li>
<li>服务器向客户端发送HTTP协议应答包</li>
<li>客户端与服务器断开连接，客户端解释HTML文档，在客户端屏幕上渲染图形结果</li>
</ul>
<h2 id="HTTP协议"><a href="#HTTP协议" class="headerlink" title="HTTP协议"></a>HTTP协议</h2><p>HTTP协议的全称：超文本传输协议，HyperText Transfer Protocol。</p>
<p>HTTP协议是互联网上应用最为广泛的一种网络协议，详细规定了浏览器和万维网服务器之间互相通信的规则，通过因特网传递万维网文档的数据传送协议。</p>
<p>HTTP协议通常承载于TCP协议之上，有时也承载于TLS或SSL协议层之上，这个时候就成了常说的<br>HTTPS。</p>
<h2 id="地址-URL"><a href="#地址-URL" class="headerlink" title="地址(URL)"></a>地址(URL)</h2><p>URL全称为：Unique Resource Location，用来表示网络资源，可以理解为网络文件路径。</p>
<p>URL的格式如下：</p>
<figure class="highlight http"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="attribute">http://host[":"port][/abs_path]</span></span><br><span class="line"><span class="attribute">http://192.168.1.1/html/index</span></span><br></pre></td></tr></table></figure>

<p>URL的长度有限制，不同的服务器的限制值太太相同，但是不能无限长。</p>
<h2 id="请求报文"><a href="#请求报文" class="headerlink" title="请求报文"></a>请求报文</h2><p>HTTP请求报文由请求行，请求头部，请求包体等组成。</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	<span class="comment">//监听</span></span><br><span class="line">	listener, err := net.Listen(<span class="string">"tcp"</span>, <span class="string">":8000"</span>)</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"Listen err = "</span>, err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">defer</span> listener.Close()</span><br><span class="line">	<span class="comment">//阻塞等待用户的连接</span></span><br><span class="line">	conn, err1 := listener.Accept()</span><br><span class="line">	<span class="keyword">if</span> err1 != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"Accept err1 = "</span>, err1)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">defer</span> conn.Close()</span><br><span class="line">	<span class="comment">//接收客户端的数据</span></span><br><span class="line">	buf := <span class="built_in">make</span>([]<span class="keyword">byte</span>, <span class="number">1024</span>*<span class="number">4</span>)</span><br><span class="line">	n, err2 := conn.Read(buf)</span><br><span class="line">	<span class="keyword">if</span> n == <span class="number">0</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"Read err = "</span>, err2)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	fmt.Printf(<span class="string">"#%v#"</span>, <span class="keyword">string</span>(buf[:n]))</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>运行程序，用浏览器请求URL： <a href="http://127.0.0.1:8000/" target="_blank" rel="noopener">http://127.0.0.1:8000/</a> ,程序后台打印结果：</p>
<figure class="highlight http"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">#GET / HTTP/1.1</span><br><span class="line"><span class="attribute">Host</span>: 127.0.0.1:8000</span><br><span class="line"><span class="attribute">Connection</span>: keep-alive</span><br><span class="line"><span class="attribute">Upgrade-Insecure-Requests</span>: 1</span><br><span class="line"><span class="attribute">User-Agent</span>: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/65.0.3325.146 Safari/537.36</span><br><span class="line"><span class="attribute">Accept:</span></span><br><span class="line">text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8</span><br><span class="line"><span class="attribute">Accept-Encoding</span>: gzip, deflate, br</span><br><span class="line"><span class="attribute">Accept-Language</span>: zh-CN,zh;q=0.9,en;q=0.8</span><br></pre></td></tr></table></figure>


<h2 id="响应数据"><a href="#响应数据" class="headerlink" title="响应数据"></a>响应数据</h2><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net/http"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">//服务端编写的业务逻辑处理程序</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">myHandler</span><span class="params">(w http.ResponseWriter, r *http.Request)</span></span> &#123;</span><br><span class="line">	fmt.Fprintln(w, <span class="string">"hello world"</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	http.HandleFunc(<span class="string">"/go"</span>, myHandler)</span><br><span class="line">	<span class="comment">//在指定的地址进行监听，开启一个HTTP</span></span><br><span class="line">	http.ListenAndServe(<span class="string">"127.0.0.1:8000"</span>, <span class="literal">nil</span>)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>运行程序，用浏览器请求URL： <a href="http://127.0.0.1:8000/go" target="_blank" rel="noopener">http://127.0.0.1:8000/go</a> ,程序会响应”hello world”在浏览器页面<br>上。</p>
<h2 id="响应报文格式"><a href="#响应报文格式" class="headerlink" title="响应报文格式"></a>响应报文格式</h2><p>服务端代码：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net/http"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">//服务端编写的业务逻辑处理程序</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">myHandler</span><span class="params">(w http.ResponseWriter, r *http.Request)</span></span> &#123;</span><br><span class="line">	fmt.Fprintln(w, <span class="string">"hello world"</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	http.HandleFunc(<span class="string">"/go"</span>, myHandler)</span><br><span class="line">	<span class="comment">//在指定的地址进行监听，开启一个HTTP</span></span><br><span class="line">	http.ListenAndServe(<span class="string">"127.0.0.1:8000"</span>, <span class="literal">nil</span>)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p>客户端代码：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	<span class="comment">//主动连接服务器</span></span><br><span class="line">	conn, err := net.Dial(<span class="string">"tcp"</span>, <span class="string">":8000"</span>)</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"dial err = "</span>, err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">defer</span> conn.Close()</span><br><span class="line">	requestBuf := <span class="string">"GET /go HTTP/1.1\r\nAccept: image/gif, image/jpeg,</span></span><br><span class="line"><span class="string">image/pjpeg, application/x-ms-application, application/xaml+xml, application/xms-xbap, */*\r\nAccept-Language: zh-Hans-CN,zh-Hans;q=0.8,enUS;q=0.5,en;q=0.3\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR3.0.30729; .NET CLR 3.5.30729)\r\nAccept-Encoding: gzip, deflate\r\nHost:127.0.0.1:8000\r\nConnection: Keep-Alive\r\n\r\n"</span></span><br><span class="line">	<span class="comment">//先发请求包，服务器才会回响应包</span></span><br><span class="line">	conn.Write([]<span class="keyword">byte</span>(requestBuf))</span><br><span class="line">	<span class="comment">//接收服务器回复的响应包</span></span><br><span class="line">	buf := <span class="built_in">make</span>([]<span class="keyword">byte</span>, <span class="number">1024</span>*<span class="number">4</span>)</span><br><span class="line">	n, err1 := conn.Read(buf)</span><br><span class="line">	<span class="keyword">if</span> n == <span class="number">0</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"Read err = "</span>, err1)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//打印响应报文</span></span><br><span class="line">	fmt.Printf(<span class="string">"#%v#"</span>, <span class="keyword">string</span>(buf[:n]))</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>先运行服务端程序，再运行客户端程序，客户端程序得到结果如下：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">#HTTP/1.1 200 OK</span><br><span class="line"><span class="attribute">Date</span>: Thu, 09 Apr 2020 13:07:35 GMT</span><br><span class="line"><span class="attribute">Content-Length</span>: 12</span><br><span class="line"><span class="attribute">Content-Type</span>: text/plain; charset=utf-8</span><br><span class="line">hello world</span><br></pre></td></tr></table></figure>

<h2 id="HTTP状态码"><a href="#HTTP状态码" class="headerlink" title="HTTP状态码"></a>HTTP状态码</h2><p>状态码由三位数据组成，第一位数据表示响应的类型，常用的状态码有五大类：</p>
<table>
<thead>
<tr>
<th align="left">状态码</th>
<th>含义</th>
</tr>
</thead>
<tbody><tr>
<td align="left">1xx</td>
<td>表示服务器已接收到客户端的请求，客户端可继续发送请求</td>
</tr>
<tr>
<td align="left">2xx</td>
<td>表示服务器已成功接收到请求，并进行处理</td>
</tr>
<tr>
<td align="left">3xx</td>
<td>表示服务器要求客户端重定向</td>
</tr>
<tr>
<td align="left">4xx</td>
<td>表示客户端的请求有非法内容</td>
</tr>
<tr>
<td align="left">5xx</td>
<td>表示服务器未能正常处理客户端的请求而出现意外错误</td>
</tr>
</tbody></table>
<p>常见的状态码举例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">200 OK：客户端请求成功</span><br><span class="line">400 Bad Request：请求报文有语法错误</span><br><span class="line">401 Unauthorized：未授权</span><br><span class="line">403 Forbidden：服务器拒绝服务</span><br><span class="line">404 Not Found：请求资源不存在</span><br><span class="line">500 Internal Server Error：服务器内部错误</span><br><span class="line">502 bad Gateway: 网关错误</span><br><span class="line">503 Server Unavailable：服务器临时不能处理客户端请求</span><br></pre></td></tr></table></figure>

<h1 id="HTTP编程"><a href="#HTTP编程" class="headerlink" title="HTTP编程"></a>HTTP编程</h1><p>Go请求标准库内建提供了net/http包，涵盖了HTTP客户端和服务器的具体实现。<br>使用net/http包可以很方便的编写HTTP客户端或服务端程序。</p>
<h2 id="HTTP服务端"><a href="#HTTP服务端" class="headerlink" title="HTTP服务端"></a>HTTP服务端</h2><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net/http"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="comment">//w, 给客户端回复数据</span></span><br><span class="line"><span class="comment">//r, 读取客户端发送的数据</span></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">HandConn</span><span class="params">(w http.ResponseWriter, r *http.Request)</span></span> &#123;</span><br><span class="line">	fmt.Println(<span class="string">"r.Method = "</span>, r.Method)</span><br><span class="line">	fmt.Println(<span class="string">"r.URL = "</span>, r.URL)</span><br><span class="line">	fmt.Println(<span class="string">"r.Header = "</span>, r.Header)</span><br><span class="line">	fmt.Println(<span class="string">"r.Body = "</span>, r.Body)</span><br><span class="line">	w.Write([]<span class="keyword">byte</span>(<span class="string">"hello go"</span>)) <span class="comment">//给客户端回复数据</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	<span class="comment">//注册处理函数，用户连接，自动调用指定的处理函数</span></span><br><span class="line">	http.HandleFunc(<span class="string">"/go"</span>, HandConn)</span><br><span class="line">	<span class="comment">//监听绑定</span></span><br><span class="line">	http.ListenAndServe(<span class="string">":8000"</span>, <span class="literal">nil</span>)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>运行程序后，用浏览器打开URL： <a href="http://127.0.0.1:8000/go" target="_blank" rel="noopener">http://127.0.0.1:8000/go</a> ,页面显示”hello go”<br>服务端运行结果：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">r.Method = GET</span><br><span class="line">r.URL = /go</span><br><span class="line">r.Header = map[Connection:[keep-alive] Cache-Control:[max-age=0] UpgradeInsecure-Requests:[1] User-Agent:[Mozilla/5.0 (Windows NT 10.0; Win64; x64)</span><br><span class="line">AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36]</span><br><span class="line"><span class="attribute">Accept:</span></span><br><span class="line">[text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8] Accept-Encoding:[gzip, deflate, br] Accept-Language:[zhCN,zh;q=0.9,en;q=0.8]]</span><br><span class="line">r.Body = &#123;&#125;</span><br></pre></td></tr></table></figure>



<h2 id="HTTP客户端"><a href="#HTTP客户端" class="headerlink" title="HTTP客户端"></a>HTTP客户端</h2><figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> main</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> (</span><br><span class="line">	<span class="string">"fmt"</span></span><br><span class="line">	<span class="string">"net/http"</span></span><br><span class="line">)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> &#123;</span><br><span class="line">	resp, err := http.Get(<span class="string">"http://127.0.0.1:8000/go"</span>)</span><br><span class="line">	<span class="keyword">if</span> err != <span class="literal">nil</span> &#123;</span><br><span class="line">		fmt.Println(<span class="string">"http.Get err = "</span>, err)</span><br><span class="line">		<span class="keyword">return</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">defer</span> resp.Body.Close()</span><br><span class="line">	fmt.Println(<span class="string">"Status = "</span>, resp.Status)</span><br><span class="line">	fmt.Println(<span class="string">"StatusCode = "</span>, resp.StatusCode)</span><br><span class="line">	fmt.Println(<span class="string">"Header = "</span>, resp.Header)</span><br><span class="line">	<span class="comment">//fmt.Println("Body = ", resp.Body)</span></span><br><span class="line">	buf := <span class="built_in">make</span>([]<span class="keyword">byte</span>, <span class="number">4</span>*<span class="number">1024</span>)</span><br><span class="line">	<span class="keyword">var</span> tmp <span class="keyword">string</span></span><br><span class="line">	<span class="keyword">for</span> &#123;</span><br><span class="line">		n, err := resp.Body.Read(buf)</span><br><span class="line">		<span class="keyword">if</span> n == <span class="number">0</span> &#123;</span><br><span class="line">			fmt.Println(<span class="string">"read err = "</span>, err)</span><br><span class="line">			<span class="keyword">break</span></span><br><span class="line">		&#125;</span><br><span class="line">		tmp += <span class="keyword">string</span>(buf[:n])</span><br><span class="line">	&#125;</span><br><span class="line">	fmt.Println(<span class="string">"tmp = "</span>, tmp)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>运行客户端程序，会自动请求”<a href="http://127.0.0.1:8000/go&quot;这个地址，此时客户端后台打印：" target="_blank" rel="noopener">http://127.0.0.1:8000/go&quot;这个地址，此时客户端后台打印：</a></p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">Status = 200 OK</span><br><span class="line">StatusCode = 200</span><br><span class="line">Header = map[Date:[Thu, 09 Apr 2020 13:25:54 GMT] Content-Length:[8] ContentType:[text/plain; charset=utf-8]]</span><br><span class="line">read err = EOF</span><br><span class="line">tmp = hello go</span><br></pre></td></tr></table></figure>

<p>此时服务端后台打印结果：</p>
<figure class="highlight go"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">r.Method = GET</span><br><span class="line">r.URL = /<span class="keyword">go</span></span><br><span class="line">r.Header = <span class="keyword">map</span>[User-Agent:[Go-http-client/<span class="number">1.1</span>] Accept-Encoding:[gzip]]</span><br><span class="line">r.Body = &#123;&#125;</span><br></pre></td></tr></table></figure>
    </div>

    
    
    
        

<div>
<ul class="post-copyright">
  <li class="post-copyright-author">
    <strong>本文作者： </strong>Ryan Shu
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  <li class="post-copyright-link">
    <strong>本文链接：</strong>
    <a href="https://notspr.com/2020/05/15/go-http-basis/" title="Go语言HTTP编程">https://notspr.com/2020/05/15/go-http-basis/</a>
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    <strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" rel="noopener" target="_blank"><i class="fab fa-fw fa-creative-commons"></i>BY-NC-SA</a> 许可协议。转载请注明出处！
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